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Sperm wars: Evolutionary biologist compiles international special issue on sperm competitionWhy do male animals need millions of sperms every day in order to reproduce? And why are there two sexes anyway? These and related questions are the topic of the latest issue of the research journal Molecular Human Reproduction published today (Oct. 16th, 2014). The evolutionary biologist Steven Ramm from Bielefeld University Bielefeld has compiled this special issue on sperm competition. In nature, it is not unusual for a female to copulate with several males in quick succession – chimpanzees are one good example. 'The sperm of the different males then compete within the female to fertilize the eggs,' says Ramm. 'Generally speaking, the best sperm wins. This may involve its speed or also be due to the amount of sperm transferred. It can also be useful for the seminal fluid to be viscous, meaning it sticks inside the female reproductive tract to try to keep other sperm at bay.'http://phys.org/news332761235.html
BiologyFri, 17 Oct 2014 10:40:46 ESTnews332761235Deploying exosomes to win a battle of the sexesThere are many biological tools that help animals ensure reproductive success. A new study in The Journal of Cell Biology provides further detail into how one such mechanism enables male fruit flies to improve their odds by stopping females from mating with other flies.http://phys.org/news328167206.html
BiologyMon, 25 Aug 2014 09:00:05 ESTnews328167206Cricket fertility found to improve with ageUWA scientists researching the seminal fluid of field crickets (teleogryllus oceanicus) are a step closer to knowing why the insect's competitive fertilisation success increases with age.http://phys.org/news321695066.html
BiologyWed, 11 Jun 2014 08:44:56 ESTnews321695066Mating is the kiss of death for certain female wormsThe presence of male sperm and seminal fluid causes female worms to shrivel and die after giving birth, Princeton University researchers reported this week in the journal Science. The demise of the female appears to benefit the male worm by removing her from the mating pool for other males.http://phys.org/news306690138.html
BiologyThu, 19 Dec 2013 15:42:30 ESTnews306690138Big bang theory: How did dinosaurs have sex?Dinosaurs were the largest animals to ever walk Earth, and they ruled the planet for more than 160 million years. The long-necked Argentinosaurus, with back vertebrae almost two metres high, possibly grew to 30 metres long and weighed up to 80 tonnes. So did the earth really shake for them when they mated?http://phys.org/news293192079.html
Other SciencesTue, 16 Jul 2013 11:14:55 ESTnews293192079Study unlocks link between sex and female brainAn international team of scientists led by Gregg Adams at the University of Saskatchewan has discovered that a protein in semen acts on the female brain to prompt ovulation, and is the same molecule that regulates the growth, maintenance, and survival of nerve cells.http://phys.org/news264678075.html
BiologyMon, 20 Aug 2012 15:00:11 ESTnews264678075Females shut down male-male sperm competition in leafcutter antsLeafcutter ant queens can live for twenty years, fertilizing millions of eggs with sperm stored after a single day of sexual activity.http://phys.org/news188137790.html
BiologyThu, 18 Mar 2010 14:00:15 ESTnews188137790Scientists show that female fruit flies can be 'too attractive' to malesFemales can be too attractive to the opposite sex -- too attractive for their own good -- say biologists at UC Santa Barbara. They found that, among fruit flies, too much male attention directed toward attractive females leads to smaller families and, ultimately, to a reduced rate of population-wide adaptive evolution.http://phys.org/news179502397.html
BiologyTue, 08 Dec 2009 14:20:01 ESTnews179502397Male fruit flies change to gain reproductive edge(PhysOrg.com) -- When it comes to wooing females, males of all species -- even fruit flies -- try to gain a competitive edge.http://phys.org/news158947334.html
BiologyTue, 14 Apr 2009 17:02:49 ESTnews158947334Newly discovered proteins in seminal fluid may affect odds of producing offspringSeminal fluid contains protein factors that, when transferred from a male to a female at mating, affect reproductive success. This is true of many different animals, from crickets to primates. In fruit flies, for instance, seminal fluid proteins influence the competitive ability of a male's sperm, and alter the female's post-mating behavior by dampening her interest in other males and cueing her to lay eggs. There is also some speculation, not yet proven, that having the wrong seminal fluid proteins might be one of several barriers to cross-breeding between closely related species.http://phys.org/news136528976.html
BiologyTue, 29 Jul 2008 05:42:56 ESTnews136528976